Answer:
Jane is 12 years old. Harvey is 36 years old.
Explanation:
We have to set up an equation.
Let j = Jane's age.
Let 3j = Harvey's age (He's 3 times Jane's age.)
So...
j + 3j = 48
4j = 48
j = 12
So Jane is 12 years old.
3 * j = 36
So Harvey is 36 years old.
To check, we can add 36 + 12.
36 + 12 = 48
Hope this helps!!! :)